Tina can spend up to $60 on dvds and cds. she buys used dvds that cost $9.50 each. the cds she buys at a discount for $12 each write an inequality to model the situation. then, determine the constraints on the variables.

Aschool puts on a play. the play costs $1,200 in expenses. the students charge $4.00 for tickets. there will be one performance of the play in an auditorium that seats 500 people. what is the domain of the function that shows the profit as a function of the number of tickets sold?  

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

How to find the exponential function y=ca^x, with points (1,2) and (2,1)